etuning Analysis and Design Optimization of an 1.3 GHz 3-cell Superconducting Cavity

Energy recovery linac (ERL) offers a promising path to superior beam quality and substantial energy savings at high average beam currents. This paper concentrates on optimizing the structure of a 1.3 GHz 3-cell superconducting cavity for high-current ERL injectors. It particularly examines helium pressure sensitivity and the detuning mechanism in the cavity. To mitigate detuning, strategies such as optimizing stiffening rings, reducing the helium vessel diameter, and enhancing cavity stiffness are proposed. Additionally, the paper outlines the mechanical design of the cavity and evaluates its performance through tuning force, Lorentz force detuning, stress, and modal analyses to ensure robustness and reliability.